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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629db24c6529e676ae1d15e0fa5169f3c1ef49531cd45e33aaadd3e2c3656932' 
  AND token = 'G+sZKoVchfW2wVKbYHh3ruVOVg2Vuk6SQT8Qt+5mQck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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