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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013dae3da6831bb211a6655dc6607cd7fc81cf04e6897ebfc2908ba21ba983fe' 
  AND token = 'v8Vim7p6hHZvr06ypGLpJso6IPaPj3QKBFVAkfle/1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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