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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b278f115944a388025bda05ec0620c3344046565d567cefb9df4c22c8d8e571d' 
  AND token = 'iIQAw9IF6BU8yWUJ5k59Tf3Llv2zRzamyqu+s4h/pQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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