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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e281d10f1cba06091edf4ca3a8af338dcfa07637243c4c599983b4de5476cd5' 
  AND token = 'WFbbJRa1pV6LUwT3n/MT/fuioaSA5JA7DqlSq8n7ddk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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