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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c211f952a21111cdfbdece626652a34e4f361136673717326f39acacc9cf02' 
  AND token = 'D5fuoNUL9xpaM9BaM4X5w/6eboU6Xn2VVQ/ZIeX/4RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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