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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18ee297b25d2cda84edda524a12d398818494b36d64bd9c9eb66ba3f5d37e956' 
  AND token = 'BdGuuiEGRVQkqSHlbAauIaOZIuduHSQy+nNHqY54p8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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