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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a527bb53ea867084037e46093b84557f83d80b97f1227772d97bc9ebe44d66' 
  AND token = 'Othi3jpJ51gJE6ku0uGplXuLEyFnrlR7b8v08YyO7YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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