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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8974e64ec4afe89412adaed84fc2a09a557ce995c5a75625504ce71252ed761' 
  AND token = 'dB3L29dKYIDvzFYJAN2SZ3GR7P0UdNK/09rCruilexA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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