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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0391f11412c069e39a26825cfcb163344dd69c550f1c0acd8cddb1075fbd64a5' 
  AND token = '/8bPD7I08dLwqfGdfKU6rEgfyItbA5a99LkHvw6U3cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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