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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f0989ebdd38ad2609ba7017b4ed54399114c8c5e75b9df88a4b54449c31a4e' 
  AND token = 'Earz+vz/e0hkjU+5lxC87rtrpyXutRuMfkXUBcKknNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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