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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0562b6736da0d0a70e2b1075e02203cedc2933f96a3736e8b6510eab7a203577' 
  AND token = 'ockaOp+pXO1pL7AmHMIGo/cBHvWdCo0LQl5KpMXgMjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}