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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4b64e0bf94e2848d2b4aa8ae3b91b86170be8af9a95da8e44c93afe0f7e11e6' 
  AND token = 'vIAHvYpMt/7yn8klm9JP5cIqOEYuHAoGMOxtbqMpusk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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