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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe0dc08de79352c3f2834828c667b5deb489d4a46790ba706fc13112f0f25387' 
  AND token = '/8ubDb6yN2EAEnWpAHtHhz+OLg1xZTWja5KhaGt6XeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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