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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f54ad1ac5e0ab8f0d808da585378370fdad9e070c526d86f2de5b0813f1687e2' 
  AND token = 'xBIaZt4gkB4/f/6IxRu7uGd8NC9Lyo3Lph4p1ZNFGm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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