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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd48c01b5c880a7e19e404e06f2f358a59f3487c603a1ace16e11909b5a4cc297' 
  AND token = 'yLd1PHBbAIjELwcQ5vKzFHvCiExOm8yLA9r5UwYW3Hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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