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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34c86ff8ea7652c8c9adc8cd83dca2ff19217786800d5bd0d382f746810e2f5' 
  AND token = '44xKV67mV9Dxy3i69XusHAoU/vE52BjnKDXGbcv58SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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