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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bcaa9c31809fb46b110199bff48817aade27b3fa5531b87aed33eb3da6d328' 
  AND token = '6MOD5Oxlh2h4GdJKPIw8fP/Cuu8FQx1bCrqyjiMcx20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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