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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee7ea36203c665f2ae145c7f6b42f0244a13f3bb0c973d3c94ff87f60750a4d' 
  AND token = 'yC+ZMMdp5IFwBcv9sE7U9MRKz6zJaisHxNSahlHnM5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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