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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a9b13c25b0aa42276812d432ef6224c6308bc4891ff2da9fdf22264a8687ff' 
  AND token = 'DhyBmNW3ARTRRqtNm8tEP25rIC7qOLI6fT8brIseHNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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