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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a3ce2e4c11a1b0920f3f3b49e21ec9255c1cf6ca912f662ff000eb2dc05175' 
  AND token = 'UXatZiw0qrglGhm1EJbpOFuxEJ0X6OpjiZstQ6KpFyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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