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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3366fb41b43513a2f5857cb61569a7b807bcfacca38448ff3a201547a6336ba' 
  AND token = 'Iy4JVlqUTEjRu9QinKSSVmZWXc5CHNB5k93HipCnXjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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