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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be47a00dcc5d0cab661e895f57c0972b849fba1d38cf11702ec2c7fad405a24' 
  AND token = 'sWBZejb7h5619oHRZdfRw1Gy8Fuq2lXGf6hIbfZd/2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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