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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba8113daea12b7703feac40b7e126acb4a17611870b7f0012868ad0827d5df5' 
  AND token = 'hrdNh6pSgKFZr4LRUVIhSxFmBPnLnwHUODOD2sNJjOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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