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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca11cf338eb5d3d2e1eebabfa7b58f8632cfa3e5325520f0e2da4ae0f18ee17' 
  AND token = '5D1Q8TjoBc54JTGxu1sWy8aCAA/FDD4e3pKbDoS4YUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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