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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd96edfabf5739154bf177a62b1b23950e6a70749aae7c7ad787d27f3a4a20b' 
  AND token = 'J77kcS4nELy/fEzW35FmmX1c0A+ntrD8k1yztOoorDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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