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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c0bf2f764b7049c3793154c6b38ae8ff69de1e5e00e1231d825770dbc48999' 
  AND token = 'yjpTxF0Qd+tT9VOVqdktgFr+ClbJeaMtYDKHonzloEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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