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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f62f0e09f97bd651a62dd5cc0de28f36933ae5ae8eba7936c8955e36f89e599' 
  AND token = 'TJ54UwXnpF2/3dXpT4Y3QFOHxBSUp7F4FhfXVUtKdWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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