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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b42d906fc1e6e07306620d225b2181ba202ad0e7c43b92f2ca34423c3ffb85' 
  AND token = 'Cnacc2KId0351A9MSy+iGB/+tL1yOxAO3jADSu2bI5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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