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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9614cc154d45e42747ce67b26efab6b6a5fcf6ff110b10379f23381b7967e11d' 
  AND token = 'zTe03/WAD9VIShWalts/Dh/1OXeFuelv5n8YjUCPme0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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