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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be42d4092e643e61c86d7b80d1f689bb2276479daa63db6c799185943cc30843' 
  AND token = 'xnmhsyADDUdiN1ZKtUWYsGoP/afC2rYxEopoLWTksXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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