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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af824959a11e356298a9ca37edc9966386b0f1ea2fd4db636735adc9f32e1758' 
  AND token = 'iulLaTC4OQT3VfiSfUnPdUUn6xsJS8hHYF6vPc9Lkrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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