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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bdc9db8a3c85b3e6241d084192f2350023d7838b04c7e270a20ea278956dbc6' 
  AND token = 'zFlOEHH5VBVDRF6T2EMTbYGovRtWmonNU1WHeJJen1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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