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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e8ce5b64e1a88ec5ea38c4bae4c32f75753c9d918660fd77a82f9bcce07ace' 
  AND token = 'RQ16wQ3d1OsseIpLmoUknbBWFuBOXRIzi2XNMbpDK5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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