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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3ffd4632c2029761da1e169fe4c4a37cd200011695455c741c2695a99adeb0' 
  AND token = '9JwDOvE1SWztvhZ7Nr7LUtt9szIFtM23w3AIsqp36Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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