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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31be79f101af22e60b518a7fdf436002ead369b4e833d301ddc74f5b4f6ecb87' 
  AND token = 'bdkuuEZPQGuyafIVNH8ul4YWOmzI38uKOH/CKW7Bnsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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