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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea090cdcdabb1962c8fb4c5972a2f1dcf04d4f42e50b344d81413c5116eee57' 
  AND token = '2GiSSui7qy6Z7SgN9FCS/dAOl4LmxAvlKtc8SGdOzAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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