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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6b0ad8b76323e613086fa217e56e59788137aa75279a9da39eff34e39e4e74' 
  AND token = 'nXYouiXT5qJxfxeZ8I1t52Ec4TayuMVAobl1tsZw2gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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