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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023518ad8c071e81a5a7d07f91202b62aff74ed92b676c68001ba97ceeef19fe' 
  AND token = 'Eag7Np6bM+glyQ5CyRMoyKBqfk25C4De3sGGNjRboYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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