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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcc67a9a08134a0a10630866666e6e7999589db792217b618605da1f829c131f' 
  AND token = '8mQMHTuZAugxjM9KxOTFDbne9yhlZkQKnx+Ikj1a8O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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