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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0302780ae231a3c6d594afb46b0b5cb8f91c5ac5e5818370c2da5c285e798a0a' 
  AND token = '0B3dhiUXg6JYMiAUygBXKtLbZXLZFNVEcWsbBB+eYV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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