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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4adae854e688d9146690e2fb7c379ba455ee9b06cf509c8e50f7915d80ff4ffb' 
  AND token = 'H4jlWklvrqPcz+MK0w3/uqA6aVSmHQy6I64439VGQmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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