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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5d8293172f89a124e7c781ba7dfb2c6edc335103997ae4472467b8b4fb71ad' 
  AND token = '4sb7J+zRBhR084F65ZE0sPKJt/40gBvDf5sAKF2UcX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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