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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5079db80e7118ff681f1834d23bd30d62ad83d2fb798da9ca511ac35b08d1e68' 
  AND token = '5baGMRoMTqUdB3x92T8u/Kz7zJHbdBfJHwMUpHV8vNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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