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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259afa428a144fdc887a2f9bd9cc3c1d3dbc36e12eb6ede8ccf2c57f98b2020b' 
  AND token = 'e7MSft1jc7/YWc+IqJTlw5QCNbrrLoMaRIkj+R2owg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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