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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66803a6b4e3e7f144d340969e8df8a78d1c4495f31b59f6f8b4a5d535ef2a1f0' 
  AND token = 'xGlyGGINM/iLJTN+bt5NolAuRltQfmhELGlzvc3w/ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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