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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14d5dcd97e206ee6a59476a158e84da45e74a72b2a5aa4542645213001dbf37' 
  AND token = 'OxaXGIS/iQUntY9zJXshj1gWhMgi3LgcYMT8ckKq83A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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