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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3525b914dbf79ccf68dc9c8c5a26b635f2e769e364e60c0529d41fe964cfe52' 
  AND token = 'Ehl70HCigVThJqJBSK+53qoPM1+n+2OyWn5Xru2bTmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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