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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c207f6808e4c19f85ed6ca71c247dee0421fafef15045972f3259a7110e225' 
  AND token = 'qlYPvhYcIJUs35iqj8XlIPLPHQDd6DhRp82DIjp7gFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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