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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ba5f7dfca2983a808ac685a861fe06b364091041d6a03a9a4fbb4c70c5b7292' 
  AND token = 'QRorUxd43/FYLKkwhfC8ngRAQH1FPBRyk1/0RWOzWbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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