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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ca6f15bf71539b613e4f3fa6c6fbbb91e6acf65e2b3ca423838dd8230c8950' 
  AND token = '/1F6/kWmd1tptmoOX9kmK7/I8bBv6pvLCrUtGCRcsgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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