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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4edce86e891a2eeca4af68325e1c8d2af3dfcd076002f4f25646e21f5c24e54f' 
  AND token = 'FwYwIV5Tj9OVu52O3miiVujjbTdzK2G0AxNNSamOgd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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