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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f764fed41f73e46f69cc11a13a03654c523c9b397167154dced322e3b02c79f8' 
  AND token = 'r16zAHGMFL21Y6ouVvKO3l5c4ltvZGLrrUL+IHCNQSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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