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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202853bd14f2ebdb95d40243b2869cbd9eea137d75797385147c4481484346a3' 
  AND token = 'Gbt4xLzVAExQpb8/AA1/sJg9p3KB9sq9rbtBki12Jr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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