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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38b8acbabb21841278ec0c1e6c11bc68c2eccde570d8549be6783f37df549a52' 
  AND token = '/g4bteEVuICw9SvPkAXKc6SZo1T3poz+MAYrhZEqiTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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