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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dac11fbfd6c63312e1eaa8c17d63f979bf232c0830d93a3de9390a0be31ad88' 
  AND token = 'Wk1Ub5/uaA77sbdRQ3qZf0md9PxzFQUFkAvdueXVcWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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