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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5979bdb94e696baf715e37d937f185fb0fba4342e5883909aee5f22adc4b27a0' 
  AND token = 'sA2LzapN1eJ1WoXtLK3WmlZg9+1j1UJC2+PJo0iF3cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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