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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b6a06689e96bf5120abdc16d4792f0f120ee427fb5fe6785f2ceb103ef396db' 
  AND token = '4XLI1ah+kNIRyr2s2QmCI3iKKpdrD72KCn55ehlB5rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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