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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da602f0e217d36dcf6b7a22d2ffd0bb333a3d60b0645d482d8c7d9daca37d569' 
  AND token = 'g8X255Ik06xfnqfiFSbYvutk/ADLAIYNI8EQt7sHX2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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