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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502d1c496744836ec1311606a15c3c7ab9c4425bb92eff496bb4f9b07a0430d9' 
  AND token = 'xIchGxVlpGMSY2LI+R0KhjseOmjx5bPVV4JY66DCwD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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