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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d63cf105d04afede0f0781c3e5ac45924de92e445de5f59522dc88d8b6ac903' 
  AND token = 'U+cC5wxoj9QrGzcEeHzU8X3WLwOFz2t2JODT8f+4DQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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