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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b348d20615adafd967481b8c7fee328a95da149c208cf3894448421a6f28f3' 
  AND token = 'YnwF1KKeKKLFxw6T0WvX44DEEuUzSie9pc7YuevHNC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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