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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa6756105a1af9e206db4d4f675f1fbecb21a26f8f1ff4b5a03ebc38f3de8f1' 
  AND token = 'qP5sGJCbKWx7TUE7mjUjwDIy7VBS2QMmjt2Dx1MUnto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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